Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
sach tranh » canh tranh
tranh tren » trinh tren, tran tren, tranh trong
trinh thi » trinh tai, dinh thi, trinh tu
khoan pho » khoan nhoi, khoan phai, khoan hoi
pho thong » he thong
khoan phu » khoa phu, khoan phai, khoa thu
phu thong » phap thong, khau thong, phan thong
thu hanh » thuc hanh, thu thanh, thuy hanh
tren cac » trien cac, tren ca, tren cay
thi cac » thi cuc, tai cac, thi tac
tu sach » thu sach, su sach, te sach

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (( thu hanh trinh thi cac khoan pho thong ) or ( tu sach tranh tren cac khoan phu thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( thu hanh trinh thi cac khoan pho thong ) OR ( tu sach tranh tren cac khoan phu thong )).
• Adding a wildcard symbol may retrieve word variants: (( thu hanh trinh thi cac khoan pho thong ) or ( tu sach tranh tren cac khoan phu thong ))*.